package person.drf.shop.product.jucTest;

import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReadWriteLock;
import java.util.concurrent.locks.ReentrantReadWriteLock;

class MyCache{
    private volatile Map<String,Object> map = new HashMap<>();

    private ReadWriteLock readWriteLock = new ReentrantReadWriteLock();

    //写操作
    public void put(String key,Object value){
        readWriteLock.writeLock().lock();
        try {
            System.out.println(Thread.currentThread().getName()+"--写入数据"+key);
            // 停一会
            try { TimeUnit.SECONDS.sleep(2); } catch (InterruptedException e) { e.printStackTrace(); }
            map.put(key,value);
            System.out.println(Thread.currentThread().getName()+"--写入完成");
        }catch (Exception e){
            e.printStackTrace();
        }finally {
            readWriteLock.writeLock().unlock();
        }

    }

    //读操作
    public void get(String key){
        readWriteLock.readLock().lock();
        try {
            System.out.println(Thread.currentThread().getName()+"--读取数据");
            // 停一会
            try { TimeUnit.SECONDS.sleep(2); } catch (InterruptedException e) { e.printStackTrace(); }
            Object result = map.get(key);
            System.out.println(Thread.currentThread().getName()+"--读取完成"+result);
        }catch (Exception e){
            e.printStackTrace();
        }finally {
            readWriteLock.readLock().unlock();
        }
    }
}

public class ReadWriteDemo {
    public static void main(String[] args) {
        MyCache myCache = new MyCache();

        for (int i = 1; i <= 5; i++) {
            final int tempInt = i;
             new Thread(()->{
                 myCache.put(tempInt+"",tempInt+"");
             },String.valueOf(i)).start();
        }

        for (int i = 1; i <= 5; i++) {
            final int tempInt = i;
            new Thread(()->{
                myCache.get(tempInt+"");
            },String.valueOf(i)).start();
        }

    }
}
